It's rock paper scissors... Yay!

RockPaperScissors

var userChoice = prompt("Do you choose rock, paper or scissors?");
var computerChoice = Math.random();

if (computerChoice < 0.34) {
	computerChoice = "Rock";
} else if(computerChoice <= 0.67) {
	computerChoice = "Paper";
} else {
	computerChoice = "Scissors";
} 

console.log("Player:   " + userChoice)
console.log("Computer: " + computerChoice);

var compare = function(userInput, computerInput) {
    if (userInput == computerInput) {
        return "The result is a tie!";
    } else if (userInput == "Rock") {
        if (computerInput == "Scissors") {
            return "Rock wins";
        } else if (computerInput == "Paper") {
            return "Paper wins";
        }
    } else if (userInput == "Paper") {
        if (computerInput == "Rock") {
            return "Paper wins";
        } else if (computerInput == "Scissors") {
            return "Scissors wins";
        }
    } else if (userInput == "Scissors") {
        if (computerInput == "Paper") {
            return "Scissors wins";
        } else if (computerInput == "Rock") {
            return "Rock wins";
        }
    }
}

console.log(compare(userChoice, computerChoice))